co well



(fie h fode L E; R. E. COWE'LL.

SPEED GAGE.

Patented Au g. 5, 1884.,

N. PETERS. Phowumn n hnr. Washington. D. C.

' UNTTED STATES PATENT OFFICE-o EDvVARD R. E. COVVELL, OF DETROIT, MICHIGAN, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO THE LOCOMOTIVE SPEED GAGE AND MILEAGE INDICATOR COMPANY, OF JERSEY CITY, N. J.

SPEED-GAGE.

SPECIFICATION forming part of Letters Patent No. 303,215, dated August 5, 1884.

Application filed January :23, 1884; (No model.)

To aZZ whom it may concern:

Be it known that I, EDWARD R. E. COWELL, of Detroit, in the county of Wayne and State of Michigan, have invented new and useful Improvements in Speed-Gage and Mileage-Indicators; and I do hereby that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to certain new and useful improvements in the construction of speed-gage and mileage-indicators; and the invention consists in the peculiar construction and arrangement of the means employed for I 5 equalizing the atmospheric pressure in the fluid-tube of the speed-gage, whereby a more positive action of the fluid is obtained under the centrifugal force of an Archimedean screw, and in the peculiar construction, arrangement, and combinations of the various parts,

all as more fully hereinafter set forth.

In the accompanying drawing, which forms a part of this specification, my improved combined device is shown in sectional elevation,

the speed-gage and mileage-indicator being adapted to be driven by the same power, and in which A represents the axle of the forward truck of a locomotive, which is provided with a worm, B, which drives a pinion, C,

0 properly journaled upon a shaft, D, in the casing E, secured to the truck.

F is a flexible shafting, one end of which is secured to one end of the shaft D,while the opposite end is secured to one end of the shaft 3 5 I, properly journaled in the head of a standard, R, rising from the top of the vessel or chamber G, which is designed to be located at any convenient point in the cab of the locomotive.

WVithin this vessel there is properly 4o stepped the vertical shaft L, carrying an Archibetween the free ends of the tubes 1? and O,

as shown, affording a continuous passage or communication between the bottom and top of the vessel and outside thereof. Back of the glass tube T is secured aspeedboard graduated into miles similar to a thermometer. The vessel G is designed to be filled or nearly 5 5 so with glycerine or other suitable fluid. The action of the screw M, when the locomotive 1s in motion, is to drive the oil or fluid up the tubes 0 T, while at the same time the air in the tube P is drawn down or siphoned down into the vessel, relieving the atmospheric pressure in advance of the rising fluid, allow ing the latter to act positively under the action of the screw, the fluid rising or falling in the tube according to the velocity of the screw, indicating to the engineer the rate of speed at which his engine is being driven.

V is a bevel-gear arranged to be driven by the pinion J, upon the shaft I, and is connected with a train of gear of the mileage-indi- 7o cator dial W, which is provided with a milehand, a ten-mile hand, a hundredmile hand, and so on, as may be desired. If the axle A makes seven hundred revolutions in a mile, the Archimedean screw is arranged to travel at the same rate, while the mile-hand of the mileage-indicator is so geared that it will make one circuit of its dial during the same time. By this arrangement of devices the engineer can at a glance see how far he has traveled from a starting-point, and at what rate per hour.

I am awarethat various speed-gages and mileage-indicators have been invented and patented, wherein a fluid is caused to rise in 8 5 a tube under the centrifugal force of a screw or flutter-wheel; but in all these the tubes have been open or closed at the top and not provided with a continuous passage or communication between the top and bottom of 0 the fluid-chamber. Hence they have been very unsatisfactory in their operation, being compelled to overcome atmospheric pressure in one case and to compress the air in the other, the devices therefore being practically 5 inoperative, while in my construction these objections are obviated, in that the air is si- I operate substantiallyinthemannerzindforthe phoned out of the tube in advance of the rispurposes described. I 5 ing fluid, equalizing the atmospheric pressure 2. In a speedgage, the combination of the Within the vessel and tube, and allowing the vessel G, provided with a proper screw or fluid to rise andl'ull positively and sensitively wheel, M, and a tube 0, carrying an index under the action of the screw. tube, T, with the return-bowl tube l", afforddhet I claim as my invention ising communication between the upper end of 20 I. A speedgage consisting;oi'nvessel,G-,prothe tube El and the top of the vessel (l, subvided with an index-tube T,the ends ofwhieh stn ntially as and for the purposes specified. are provided with the tubes 0 1?, communi- EDYVARD It. 1*). GOWELL. outing, respectively, with the bottom and top "Witnesses: of the vessel G, withiuwhioh an Arehiinodeau .ll. SCULLY, screw or other suit-able wheel is arranged to II. S.- SHRACUE. 

